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Gramp's GT
08-08-2005, 09:18 PM
My RPM seem to sometime surge when I am I crusing. Not a big flucuation but a couple of hundred for a couple of second for 3 or four time then it seem to go back to normal. This happens whether I have cruise control on or not.

I had the fuel line and injector cleaned with the gm system along with the fuel filter thinking that maybe that would fix it but that didn't work.

Could it be my fuel pump is giving me a warning that it is going to break soon? I had my fuel pump replaced a couple of years ago.

rizer
08-10-2005, 12:43 AM
Bad gas possibly? I know my car does crazy stuff when i get a bad batch

Gramp's GT
08-13-2005, 09:44 PM
I thought about that too but it seems to happen at different times and only for a few moments at a time. Maybe it is just my imagination!!

Treviathon
08-15-2005, 10:26 AM
My car does the exact same thing, it is more noticeable going up hills, and seems to happen the most around 80km/h (50mph). Almost like the car can't make up its mind as to which gear to be in. It surges about 200-300rpm as well. I've had my car into the shop and had the tranny flushed, and the same thing happens. I'm out of ideas, and I guess we are not alone, there have been other similar posts here as well:

http://www.grandamgt.com/forum/showthread.php?t=54138

http://www.grandamgt.com/forum/showthread.php?t=54216

http://www.grandamgt.com/forum/showthread.php?t=24465

Search for surging and you will get a tonne of threads about this.